Thanks for the pictures Eric, but the brightness makes it hard to tell. The BK 465 setup guide sais the 21EAP4 should use the "A" socket, but the your "socka" pic doesn't look like the plug. There needs to be a pin hole in the middle of 4 other pins. The schematic for adapter "A" shows an 8 pin socket but only 6 holes are wired up so that's confusing also. I'm adding pictures below of the actual tube connector and jack on the circuit board. The plug is about 5/8" in diameter.
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Rick Fray
Cibolo, TX
Novice vacuum tube fan
Last edited by rickfray; 02-24-2013 at 09:55 PM.
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